<?php

namespace Assetic\Asset;

use Assetic\Filter\FilterInterface;

/**
 * Represents an asset loaded from a file.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class FileAsset extends BaseAsset
{
	private $source;


	/**
	 * Constructor.
	 *
	 * @param string $source     An absolute path
	 * @param array  $filters    An array of filters
	 * @param string $sourceRoot The source asset root directory
	 * @param string $sourcePath The source asset path
	 *
	 * @throws InvalidArgumentException If the supplied root doesn't match the source when guessing the path
	 */
	public function __construct($source, $filters = array(), $sourceRoot = null, $sourcePath = null)
	{
		if (null === $sourceRoot) {
		    $sourceRoot = dirname($source);
		    if (null === $sourcePath) {
		        $sourcePath = basename($source);
		    }
		} elseif (null === $sourcePath) {
		    if (0 !== strpos($source, $sourceRoot)) {
		        throw new \InvalidArgumentException(sprintf('The source "%s" is not in the root directory "%s"', $source, $sourceRoot));
		    }

		    $sourcePath = substr($source, strlen($sourceRoot) + 1);
		}

		$this->source = $source;

		parent::__construct($filters, $sourceRoot, $sourcePath);
	}


	public function load(FilterInterface $additionalFilter = null)
	{
		$this->doLoad(file_get_contents($this->source), $additionalFilter);
	}


	public function getLastModified()
	{
		return filemtime($this->source);
	}
}
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